Form I-UDA, P/N 195673 Rev 13, Page 33
FIGURE 3 - Venter
Wheel Position on
Shaft
������������������
������������������
�������������
�����������
������������������
���
��������������
�������
������
���������
�����
�������
�������������
�������������
������������������
����������������������
���
������
���������
�����
�����
�������������������
������
�����
����������������������
����������������
��������������
10..6 Venter Motor
and Wheel
10..5 Fan Motor, Fan
Blades, and Guard
Remove dirt and grease from the motor, the fan guard, and blades. Use care when
cleaning the fan blades to prevent causing misalignment or imbalance. Check that the
hub of the fan blades is secure to the shaft.
Follow these instructions for replacement of the fan guard, fan motor and/or fan
blades.
FIGURE - Fan
Blade Position on
the Shaft
Replacement Instructions
1. If the heater is installed, turn off the gas and disconnect the electric power.
2. Open the access door and disconnect the fan motor wires, capacitor wires at the
capacitor, and ground screw.
3. Remove the assembled parts (the fan guard, the motor and the fan blade).
4. Disassemble and replace whatever parts are needed and reassemble using what
-
ever part(s) are being replaced and the original parts.
Be sure the fan blade is in the proper position on the shaft; refer to the illustration
and table in
FIGURE .
Position the assembly on the heater. Attach the fan guard.
Rotate the fan blade to check for adequate clearance. If adjustment is required,
loosen the mounting screws, re-position the fan guard, and tighten the screws.
Rotate the fan blade and re-check for adequate clearance. Repeat this procedure
until the assembly is positioned properly.
5. Reconnect the fan motor wires according to the wiring diagram and close the
access panel.
6. Restore power to the heater and turn on the gas. Light, following the instructions
on the lighting instruction plate. Check for proper operation.
A
Fan
Blade
Sizes
30-250
Motor
Setscrew
A
Sizes
300-400
Motor
Fan
Blade
Setscrew
UDAP & UDAS
Size
30 45 UDAP-45LN
(with ALB) 60
75 100 15 150 175 00 5, 50,
300
350 400
A
inches
1
9/16
3/4
1-1/2
2-1/8 2-3/8
2-5/16
2-3/8 2-1/8 1-5/8
2
1-7/8 1-3/8
mm
25 14
19
38
54
60
59
60
54
41
51
48
35
Setscrew torque
in/lbs ±10
80
120
130
Remove dirt and grease from the motor casing, the venter housing, and the venter
wheel. Venter motor bearings are permanently lubricated. Follow these instructions for
replacement of the venter motor and wheel assembly. Keep all hardware removed to
be used in re-assembling and installing the replacement parts.
1. Turn off the gas and disconnect the electric power.
2. Open the burner/control compartment access panel.